I tried it that way too. But it was too far off when we went outdoors. But then, I started at 25 yards at that time. I thought maybe do it at home and get the vertical nailed, then crank it up and see if I could get lucky and hit paper at 25? Still, my point was, to me, it seems like it might be more of a private by yourself thing rather than around a bunch of others shooting tat the same time. Your mileage may vary!I do my laser bore sight in on my kitchen table, aimed at a wall twenty feet away. Can get very close to zero that way, then fine tune at the range with Shoot N See targets, range depending on caliber and load.